<template>
	<view>
		<my-search @click="gotoSearch()"></my-search>

		<view class="scroll-view-container">
			<!-- 左侧滑动区域 一级分类-->
			<scroll-view scroll-y="true" class="left_scroll-view" :style="{height:windowHeight+'px'}">
				<view :class="['left-scroll-view-item', index === active?'active':'']" v-for="(item,index) in cateList"
					:key="index" @click="activeChanged(index)">{{item.cat_name}}</view>
			</scroll-view>
			<!-- 右侧二级分类区域 -->
			<scroll-view scroll-y="true" :scroll-top="scrollTop" class="right-scroll-view"
				:style="{height:windowHeight+'px'}">
				<view class="cate-lv2" v-for="(item,index) in cateLevel2" :key="index">
					<!-- 二级分类标题 -->
					<view class="cate-lv2-title">
						/ {{item.cat_name}} /
					</view>
					<!-- 三级分类 -->
					<view class="cate-lv3">
						<view class="cate-lv3-item" v-for="(item2,index2) in item.children" :key="index2"
							@click="gotoGoodsList(item2)">
							<image :src="item2.cat_icon" mode="widthFix" class="cate-lv3-img"></image>
							<text class="cate-lv3-title">{{item2.cat_name}}</text>
						</view>
					</view>

				</view>
			</scroll-view>
		</view>
	</view>
</template>

<script>
	import badgeMixin from '@/mixins/tabbar-badge.js'

	export default {
		mixins: [badgeMixin],
		data() {
			return {
				windowHeight: 0,
				// 分类列表
				cateList: [],
				active: 0,
				// 二级分类数组
				cateLevel2: [],
				//滚动条距离顶部的距离
				scrollTop: 0
			};
		},
		onLoad() {
			// 获取设备可使用窗口宽度，减去搜索框的50
			this.windowHeight = uni.getSystemInfoSync().windowHeight - 50
			this.getCate()
		},
		methods: {
			// 获取分类数据
			async getCate() {
				const {
					data: res
				} = await uni.$http.get('/api/public/v1/categories')
				if (res.meta.status !== 200) return uni.$showMsg()
				this.cateList = res.message
				// console.log(this.cateList);
				this.cateLevel2 = res.message[0].children
			},
			// 左侧分类选中，二级分类赋值
			activeChanged(i) {
				this.active = i
				this.cateLevel2 = this.cateList[i].children
				// 让它的值在0 、1 之间切换
				this.scrollTop = this.scrollTop === 0 ? 1 : 0
			},
			gotoGoodsList(item) {
				uni.navigateTo({
					url: '/subpkg/goods_list/goods_list?cid=' + item.cat_id
				})
			},
			gotoSearch() {
				uni.navigateTo({
					url: '/subpkg/search/search'
				})
			}
		}
	}
</script>

<style lang="scss">
	.scroll-view-container {
		display: flex;
	}

	.left_scroll-view {
		width: 120px;
	}

	.left-scroll-view-item {
		line-height: 60px;
		background-color: #F7f7f7;
		text-align: center;
		font-size: 12px;

		&.active {
			background-color: #fff;
			color: #c00000;
			position: relative;

			&::before {
				content: ' ';
				display: block;
				width: 3px;
				height: 30px;
				background-color: #c00000;
				position: absolute;
				top: 50%;
				left: 0;
				transform: translateY(-50%);
			}
		}
	}

	.cate-lv2-title {
		font-size: 12px;
		font-weight: bold;
		text-align: center;
		padding: 15px 0;
	}

	.cate-lv3 {
		display: flex;
		flex-wrap: wrap;

		.cate-lv3-item {
			width: 33.33%;
			display: flex;
			flex-direction: column;
			align-items: center;
			margin-bottom: 10px;

			image {
				width: 60px;
				height: 60px;
			}

			text {
				font-size: 12px;
			}
		}
	}
</style>
